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  #46 (permalink)  
Old 08-17-2008, 06:56 PM
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I need assistance.

I have a 90 Mustang 5.0 fuelie engine in my hotrod with the factory AC compressor for R-12. Barrier hoses, etc.
I use an underdash Mark 4 Allegro dated August, '63, which has had the expansion valve replaced.
I plan to put two condensers up front this time. I have 22 inches wide and 17 high to work with and almost 3" thick.

The car cooled well with R-12 and now will be upgraded to new stuff. I am considering Freeze 12, a blend of 80% 134 and 20% 142, which has a better pressure/temp curve and cools better than 134 in conversions I have seen.


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  #47 (permalink)  
Old 08-17-2008, 08:34 PM
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Gee, we have to take into consideration that this is an older system. The best route would be to stick with the refrigerant you had.

Changing it out would require that you make an effort to determine if your old compressor is going to work with 134a. The pressures are higher for one thing. I am not sure if the seals are of a material that will take exposure to R134a either. The good side is that you have an Thermoexpansion valve.

I am not sure about having that much condenser area, that may present more problems than solutions for you.
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